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Business cards. (meisiya.net)
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Ads for escort services. (Jan Chipchase)
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Tattoos. (Kaywa.com)
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Branded QR codes. (Eurotechnology.com)
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T-shirts. (Jos' Blog)
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Billboards. (Ogilvy)
Earlier:
Barcodes for TV Commercials
Create Your Own QR Code
3D Barcodes To Store Video